socat/xio-ip4.c

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2008-01-27 12:00:08 +00:00
/* $Id: xio-ip4.c,v 1.13 2007/03/06 21:08:38 gerhard Exp $ */
/* Copyright Gerhard Rieger 2001-2007 */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this file contains the source for IP4 related functions */
#include "xiosysincludes.h"
#if WITH_IP4
#include "xioopen.h"
#include "xio-socket.h"
#include "xio-ip.h"
#include "xio-ip4.h"
/* check if peer address is within permitted range.
return >= 0 if so. */
int xiocheckrange_ip4(struct sockaddr_in *pa, struct xiorange_ip4 *range) {
struct in_addr *netaddr_in = &range->netaddr;
struct in_addr *netmask_in = &range->netmask;
char addrbuf[256], maskbuf[256];
char peername[256];
/* is provided client address valid? */
if (pa->sin_addr.s_addr == 0) {
Warn("invalid client address 0.0.0.0");
return -1;
}
/* client address restriction */
Debug2("permitted client subnet: %s:%s",
inet4addr_info(ntohl(netaddr_in->s_addr), addrbuf, sizeof(addrbuf)),
inet4addr_info(ntohl(netmask_in->s_addr), maskbuf, sizeof(maskbuf)));
Debug1("client address is 0x%08x",
ntohl(pa->sin_addr.s_addr));
Debug1("masked address is 0x%08x",
ntohl(pa->sin_addr.s_addr & netmask_in->s_addr));
if ((pa->sin_addr.s_addr & netmask_in->s_addr)
!= netaddr_in->s_addr) {
Debug1("client address %s is not permitted",
sockaddr_inet4_info(pa, peername, sizeof(peername)));
return -1;
}
return 0;
}
#endif /* WITH_IP4 */